COA High Availability & Fault Tolerance Flashcards
6 cards from real COA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 COA High Availability & Fault Tolerance flashcards as text
Which OpenStack service provides load balancing as a service for high availability deployments?
Answer: Octavia
Octavia is OpenStack's load balancing service that provides scalable, highly available load balancers for applications.
What is the default availability zone name created by Nova during OpenStack installation?
Answer: nova
Nova creates a default availability zone named 'nova' that contains all compute nodes not explicitly assigned to another zone.
Which database clustering solution is most commonly used for OpenStack controller high availability?
Answer: MariaDB Galera Cluster
MariaDB Galera Cluster provides synchronous multi-master replication for OpenStack's database layer in HA controller deployments.
What Nova operation moves all instances from a failed compute host to other available hosts?
Answer: nova evacuate
Nova evacuate transfers instances from a failed compute host to healthy hosts, restoring service after hardware failure.
Which messaging backend with mirrored queues is most commonly deployed for OpenStack RPC high availability?
Answer: RabbitMQ with mirrored queues
RabbitMQ with mirrored queues is the standard OpenStack messaging backend, providing HA for inter-service RPC communication.
What is the primary role of Pacemaker/Corosync in an OpenStack HA controller deployment?
Answer: Managing stateful service failover and virtual IP resources
Pacemaker/Corosync manages cluster resources such as virtual IPs and stateful services, triggering automatic failover when a node fails.